From f3e22f48f37c1e14441c9f72ca8e63b1d4516745 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Sun, 3 Jan 2010 03:44:53 +0100 Subject: reiserfs: Fix mistake in down_write() conversion Fix a mistake in commit 0719d3434747889b314a1e8add776418c4148bcf (reiserfs: Fix reiserfs lock <-> i_xattr_sem dependency inversion) that has converted a down_write() into a down_read() accidentally. Signed-off-by: Frederic Weisbecker Cc: Christian Kujau Cc: Alexander Beregalov Cc: Chris Mason Cc: Ingo Molnar --- fs/reiserfs/xattr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/reiserfs/xattr.c') diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c index 9623cfe2371c..75d3706734ec 100644 --- a/fs/reiserfs/xattr.c +++ b/fs/reiserfs/xattr.c @@ -495,7 +495,7 @@ reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, return PTR_ERR(dentry); } - down_read(&REISERFS_I(inode)->i_xattr_sem); + down_write(&REISERFS_I(inode)->i_xattr_sem); reiserfs_write_lock(inode->i_sb); -- cgit v1.2.1 From 4f3be1b5a98587b86cae05aa5d129dd0b3fff466 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Tue, 5 Jan 2010 02:14:30 +0100 Subject: reiserfs: Relax lock on xattr removing When we remove an xattr, we call lookup_and_delete_xattr() that takes some private xattr inodes mutexes. But we hold the reiserfs lock at this time, which leads to dependency inversions. We can safely call lookup_and_delete_xattr() without the reiserfs lock, where xattr inodes lookups only need the xattr inodes mutexes. Signed-off-by: Frederic Weisbecker Cc: Christian Kujau Cc: Alexander Beregalov Cc: Chris Mason Cc: Ingo Molnar --- fs/reiserfs/xattr.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'fs/reiserfs/xattr.c') diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c index 75d3706734ec..4899d789ba67 100644 --- a/fs/reiserfs/xattr.c +++ b/fs/reiserfs/xattr.c @@ -451,7 +451,9 @@ static int lookup_and_delete_xattr(struct inode *inode, const char *name) } if (dentry->d_inode) { + reiserfs_write_lock(inode->i_sb); err = xattr_unlink(xadir->d_inode, dentry); + reiserfs_write_unlock(inode->i_sb); update_ctime(inode); } @@ -485,10 +487,14 @@ reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, if (get_inode_sd_version(inode) == STAT_DATA_V1) return -EOPNOTSUPP; - if (!buffer) - return lookup_and_delete_xattr(inode, name); - reiserfs_write_unlock(inode->i_sb); + + if (!buffer) { + err = lookup_and_delete_xattr(inode, name); + reiserfs_write_lock(inode->i_sb); + return err; + } + dentry = xattr_lookup(inode, name, flags); if (IS_ERR(dentry)) { reiserfs_write_lock(inode->i_sb); -- cgit v1.2.1 From 31370f62baa1460b785cee9944bdcaf63d19e567 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Thu, 7 Jan 2010 15:55:31 +0100 Subject: reiserfs: Relax reiserfs_xattr_set_handle() while acquiring xattr locks Fix remaining xattr locks acquired in reiserfs_xattr_set_handle() while we are holding the reiserfs lock to avoid lock inversions. Signed-off-by: Frederic Weisbecker Cc: Christian Kujau Cc: Alexander Beregalov Cc: Chris Mason Cc: Ingo Molnar --- fs/reiserfs/xattr.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/reiserfs/xattr.c') diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c index 4899d789ba67..7fee995c25ab 100644 --- a/fs/reiserfs/xattr.c +++ b/fs/reiserfs/xattr.c @@ -559,8 +559,12 @@ reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, .ia_size = buffer_size, .ia_valid = ATTR_SIZE | ATTR_CTIME, }; + + reiserfs_write_unlock(inode->i_sb); mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); down_write(&dentry->d_inode->i_alloc_sem); + reiserfs_write_lock(inode->i_sb); + err = reiserfs_setattr(dentry, &newattrs); up_write(&dentry->d_inode->i_alloc_sem); mutex_unlock(&dentry->d_inode->i_mutex); -- cgit v1.2.1